currentlz alot of BTC for GBP trade?

[treewalker]

Hi, I got a question.
I just looked at britcoin.co.uk, the price for 1 BTC exploded today from 8 to 14 GBP per BTC. Probably there is alot of request for buying BTC for GBP right. At the same time the price at bitmarket.eu did not change in equivalent.
How are these prices calculated? Is it derived from the bids/aks of the sites marketplace or rather from global rating of BTC-GBP , BTC-EURO demand?
Thanks!

[ziv]

The britcoin price is based on actual reccent trades. I assume bitmarket is the same.